[Bug target/19923] openssl is slower when compiled with gcc 4.0 than 3.3

[yx at cs dot ucla dot edu]

------- Additional Comments From yx at cs dot ucla dot edu  2005-06-01 20:47 -------
When we ran 'openssh speed md2', we did see that gcc-4.0 was slower
than earlier versions, so we created a minimal test case, which
we will attach.  Here is how long it took to run a 34 megabyte
file through the test program when compiled with various compilers and
options:

gcc-2.95.3 -fPIC -O1 4.940s
gcc-4.0.0  -fPIC -O1 3.510s
gcc-3.4.3  -fPIC -O1 5.190s

gcc-2.95.3 -fPIC -O2 3.470s
gcc-3.4.3  -fPIC -O2 3.460s
gcc-4.0.0  -fPIC -O2 4.050s

gcc-2.95.3 -fPIC -O3 3.400s
gcc-3.4.3  -fPIC -O3 3.740s
gcc-4.0.0  -fPIC -O3 4.010s

This test was done on a pentium 4 workstation, and no smoothing was
done on the resulting times, but they seemed to be repeatable.
We also tried without -fPIC, but did not see as large a regression there.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19923